HANSEN’S DISEASE

By Stephanie Burns, RN, DNC

Objectives

• To discuss brief history of Hansen’s disease

• To discuss how to diagnose Hansen’s disease

• To explain classifications of Hansen’s disease

• To discuss reactions in Hansen’s disease

• To discuss treatment of Hansen’s disease

HANSEN’S DISEASE

HISTORY • 1.) Leprosy is a chronic

infectious disease caused by Mycobacterium leprea bacteria.

• 2.) The earliest descriptions recorded about 600 BC in India.

• 3.) 1873 Gerhard Hansen, a Norwegian physician, was recognized as first person to identify the bacterium, Mycobacterium leprae, as the cause of the disease.

• 4.) During this period until early 1900’s leprosy was treated with hydrocarpus oil. This oil was extracted from dried fruit of the hydrocarpus tree.

• 5.) Leper colonies have existed since the Middle Ages with purpose to isolate lepers and prevent spreading the disease.

• 6.) 1941 sulfone, (promin), was introduced to treat HD. Although this medication is reported as being somewhat successful in curing HD, it was administer IM and quite painful.

• 7.) 1950 dapsone became the standard

treatment for HD

• 8.) 1982 The World Health Organization

recommended multidrug therapy (MDT)

with dapsone, rifampin, and clofazimine.

• 1995 WHO has made MDT available free

of charge to all patients worldwide

DEFINITION OF PREVALENCE

OF LEPROSY

• Refers to estimated population of

people who are managing Leprosy at a

given time

DEFINITION OF INCIDENCE OF

LEPROSY

• Refers to the annual diagnosis rate or

the number of new cases of Leprosy

diagnosed each year

• Currently Brazil, Madagascar,

Mozambique, Tanzania and Nepal are

listed as having 90% of the Hansen’s

disease cases.

Beginning of 2008 – Global registered prevalence of leprosy = 212,802. New cases detected during 2007 was 254,525

2011 - global prevalence registered at

192,246 cases. New cases detected during

2010 was 228,474 (excludes small # of cases

in Europe.

U.S. DATA

• 6500 cases of Leprosy in U.S.

• 90% immigrants from countries where disease is endemic.

• 600 cases with active disease and requiring drug treatment

• 200 – 250 cases reported each year.

U.S DATA CONTINUED

• The Largest #’s of

Leprosy cases in

U.S. are in

• California

• Texas

• Hawaii

• Louisiana

• Florida

• New York

• Puerto Rico

LAHEY CLINIC DATA

2010 2011 2012

Pts on Roster---269 --------272 --------276

Newly Dx-----------6------------4------------3

Active Status-----95-----------99---------102

Brazilian Pts--------6------------4------------2

REASONS FOR DECREASE

IN REGISTEREDED CASES

• Shortened treatment period and revised definition of a case of HD. Current definition of a case, according to WHO is a patient requiring chemotherapy.

• Therefore, patients who have completed their chemotherapy are no longer counted as cases.

• In summary the number of cases on treatment has decreased over the last decade but the new cases have not dramatically decreased

.

RISK FACTORS

• Highest risk for population living in

endemic areas with poor living conditions,

contaminated water, poor diet.

• Individuals with compromised immune

system

• Men are two times more likely to contract

leprosy than women

• Usual source of infection is from

patients with untreated lepromatous HD.

Large amounts of bacilli can be found in

their upper respiratory tract and nasal

mucus membranes.

• More prevalent with prolonged and/or

close contact with patient.

• Transmission of M leprae is through droplet or dust.

• M leprae can remain viable,outside the body, for 24 hours to several days.

• There is no evidence of sexual transmission.

• Armadillos found in Texas and

Louisiana, have been found to be

infected with M leprae. Therefore

are suspected of being a source of

transmission of the disease to

humans.

• Heredity theory effecting the immune system. Some

family members have predisposition to disease.

(Example:Why one sibling exposed to the disease

will become infected, while another sibling having

same exposure will not contract HD)

• Incubation period once infected by m leprae can be

from 6 months to 40 yrs.

DIAGNOSIS

• THREE CARDINAL SIGNS

1.) Anesthesia

2.) Enlarged nerves

3.) Acid-fast bacilli

DIAGNOSIS CONTINUED

• Localized lesion

– Hypopigmented

– Hyperpigmented

– Erythematous

– Sensation loss

• Nerve involvement is always present in HD

• Bacilli can be found in nerves at almost any

level from periferal nerves to the larger

proximal nerve trunks.

• Acid bacilli can be detected in skin

through:

skin smears

skin bx

PERIPHERAL NERVES

• FACIAL

• GREAT AURICULAR

• MEDIAN

• ULNAR

• RADIAL

• RADIAL CUTANEOUS

• PERONEAL

• POST TIBIAL

• Bacilli tend to accumulate in the cooler parts of the body

– Ears

– Forehead

– Chin

– Nose

– Eye

– Elbow

– Wrist

– Knee

– Testicles

– Ankle

• Nerves are usually superficial, enlarged,

painful and can be palpated easily.

• Damage to the nerves cause sensory,

and motor damage

• Skin - Skin lesions should be tested with monofilament or article that is able to give a light touch, such as a cotton wisp or feather. This test will indicate if patient has anesthesia within skin lesions.

• Eyes – look for signs of redness, tenderness or evidence of lid weakness, which can cause drooping of eye lid (lagophthalmus).

Examination of the skin, eyes, hands, and

feet.

DIAGNOSIS CONTINUED

• Hands – observe for

loss of sensation,

weakness of the

intrinsic muscles of

the hand or muscle

atrophy which can

cause claw hand

deformity

• Lower extremities –

examine for loss of

sensation, muscle

atrophy, foot drop, or

claw toes. Due to

insensitive feet

always check for

pressure or trauma

ulcers.

CLASSIFICATION OF

HANSEN’S DISEASE

• Two systems of classification • 1.)Ridley and Jopling classification

» Clinical

» Immunology

» Histology

» Bacteriology

• 2.) the WHO two group classification

» Pausibacillary

» Multibacillary

Ridley and Jopling

classification

Based on immunologic response of the host to M leprae

Indeterminate

– TT (polar tuberculoid)

– BT (borderline tuberculoid)

– BB (borderline)

– BL (borderline lepromatous

– LL (lepromatous)

CLASSIFICATION OF LEPROSY

BY WHO • 11) Single lesion

Paucibacillary HD - • (SLPB)

• 2) Paucibacillary HD –

• PB

• 1 lesion, no trunk involvement, sensory loss within lesion

• 2-5 # lesions, generally asymmetrical distribution with definite loss of sensation and no more than 1 nerve trunk involvement

WHO CLASSIFICATION

CONTINUED

• Multibacillary (MB) – • More than 5 lesions

with more or less

symmetrical

distribution, loss of

sensation in various

areas and may have

many nerve trunks

involved

HD spectrum

Classification Zones of the HD

spectrum

_________________________________

Ridley – Jopling TT BT BB BL LL

WHO Classification PB MB

Indeterminate

• One or few vague lesions

• Hypopigmented or erythematous

macules

• Favors extremities, buttock, or face

• Minimally impaired sensation

• No peripheral nerve enlargement

TUBERCULOID

TT - Polar • One or few lesions

• Sharply marginated,

scaling macules or

plaques, sometimes

elevated edges

• Lesions anesthetic

• Sometimes enlarged

nerve in area of

lesion

BODERLINE TUBERCULOID

(BT) • Few to many

erythematous,

hypochromic

plaques with scaling

surface with well

defined margins

which may have

small satellite

lesions, usually

annular

BT continued

• Lesions anesthetic asymmetrical

• Several peripheral nerves involved

BODERLINE

(BB)

• Several succulent

plaques with sharply

demarcated central

area and edges sloping

into surrounding normal

skin

• Large erythematous

irregular infiltrated

bands with central

uninvolved anesthetic

areas

(BB) continued

• Moderate anesthetic lesions widespread

and asymmetrical peripheral nerve

involvement

BODERLINE

LEPROMATOUS

(BL)

• Many roughly symmetrical

shiny, erythematous and

sometimes hypopigmented

macules, papules, nodules with

sloping edges.

(BL) continued

• Lesions slightly anesthetic

• Widespread and less asymmetrical

peripheral nerve involvement

LEPROMATOUS LEPROSY

(LL)

• Early (LL) --

• 1) Macules small,

multiple and

symmetrical

• 2) Smooth shiny

surface with

indistinct margins

• 3) faintly

erythematous to

copper - colored

EARLY (LL) CONTINUED

• Macules become more evident after

exposure to sun

• Eyebrow hair is sparse

• Lesions hazy, indistinct and

asymptomatic

INFILTRATED (LL)

• 1) Succeeds macular form

• 2) Skin is thickened, erythematous and shiny

• 3) Infiltrated plaques are glossy, soft and slope towards periphery

• 4) Sensory loss slight in infiltrated areas

• 5) Skin lesions generalized but do not occur in axilla and groin areas

(LL) continued

• Madarosis of eyebrows

• Nasal mucosal ulceration

• Usually no sensory impairment in early

stages

• Later symmetrical peripheral neuropathy of

arms and legs with stocking and glove

anesthesia and of facial nerve

• Eye involvement (conjunctiva, cornea,and

iris)

LEPROMATOUS

(LL) • Multiple and

symmetrical erythematous and copper colored macules, later indurations followed by nodulation of face, especially ears and nose,extremeties,joints

• and trunk

REACTIONS IN HD

1) Reversal Reaction

BT

2) Erythema Nodosum Leprosum (ENL)

BL

LL

Reversal reaction Sx

– 1) Edema and erythema of previously

visible skin lesions.

– 2) Sudden nerve damage, with swelling

and pain

– 3) Fever

– 4) New, well-defined erythematous skin

lesions

– 5)Edema of hands and feet

BT IN REACTION

• Allergic reaction causes edema

• Body crying to get rid of dead

organisms

• Body is truly getting better

ENL SX’S

• 1) Red, tender, painful nodules

• 2) Fever, malaise

• 3) Painful neuritis, arthritis,

lymphadenopathy

• 4) Eye involvement –iritis, scleritis

• 5) Edema of extremities

EYE INVOLVEMENT

WITH ENL

• Infiltration of dead

organisms into eye

• Nodules in iris

• Distorted pupil from

reactions

LUCIO HD

• 1) Diffuse LL

• 2) Patients of

Mexican and Costa

Rican origin

• 3) No nodules

• 4) No wrinkles

• 5) No sweat

• 6) No body hair » Bonita (pretty

in Spanish)

LUCIO PHENOMENON

REACTION

• Vessels become

plugged causing

vasculitis

• Severe ulcerations

of skin

US TREATMENT PLAN

• PAUCIBACILLARY

– Treat for 1 yr Rifampin 300mg – 600mg daily

Dapsone 100mg daily

Follow for 5 yrs

US TREATMENT CON’T

• Multibacillary

• Treatment for 2 yrs - Rifampin 300mg – 600mg

Dapsone 100mg daily

Clofazimine 50mg daily

» Follow for 5 – 10 years

ADVANTAGES OF MDT

• Isolation of patient is not necessary.

Disease is very difficult to transmit to

another person.

• Patient is non communicable once

started on MDT.

• Relapse is rare

TREATMENT OF

REACTIONS

• Reversal Reaction • Analgesics for nerve

pain

• Prednisone for

severe reaction

TREATMENT OF REACTIONS

CONTINUED

• ENL • Prednisone 40 – 80

mg

– Daily single dose

– After reaction

controlled, slow

tapering 5mg

every 1-2 weeks

TREATMENT OF REACTIONS

CONTINUED

• ENL • Thalidomide 50 –

200mg daily

• Clofazimine 300mg

daily for 4 – 6

wks reduced to

200 mg for several

months

Clofazimine continued

• When prednisone is discontinued for 3

months then Clofazimine can be

reduced to

• 50 mg daily

FOLLOW UP AFTER

COMPLETION OF TREATMENT

• Paucibacillary (PB)

–Every six months for two years

–Annually for three years

FOLLOW UP AFTER

COMPLETION OF TREATMENT

• Multibacillary (MB)

–Every six months for two years

–Annually for eight years

CASE STUDY

HISTORY

• 34-year-old Portuguese speaking male

from Brazil

• Entered U.S. June 2005. At that time

started working on farm in N.H. doing

landscaping

• Spring of 2006 noted a few “mosquito

bites” on his arms that itched and turned

red.

HISTORY CONTINUED

• Red bumps started on arms,

progressively more involved on his

lower legs, trunk and face.

• Wife sent him medication from Brazil

called Meticorten (prednisone), which

he took for several months, with more

swelling of his skin lesions.

HISTORY CONTINUED

• Therefore stopped this medication

around April 2007.

• Patient saw local Dermatologist May

2007

– Presented with diffuse large fleshy nodules

on face, arms, legs, trunk, back of neck

and ears.

– Lesions on trunk were hyperpigmented, flat

and diffuse

PHYSICAL EXAM

- Lesions on knees dry with light scale

- Hands diffusely swollen with lesions that are more erythematous

- Normal ear canals.

- Skin lesion extruding from right lower eyelid. – Lesion on posterior soft palate.

• WHAT COULD BE DONE TO

SUPPORT

CLINICAL DIAGNOSIS?

• Skin Biopsy

• Skin Smears

• Palpate Enlarged Nerves

• Sensory Testing

BIOPSY RESULTS

• Shave biopsy skin of left abdomen

– Lepromatous Leprosy

– Fite stains reveal numerous mycobacteria

FOOT AND HAND SCREENING

• Multiple foot ulcers

• Feet swollen

• No weakness in ankle or foot

• No loss of protective sensation

• Hands residual texture with sensory

testing

• No muscle weakness

• No tender nerves

TREATMENT PLAN

• Clofazimine 100mg daily

• Rifampin 300 mg daily

• Ofloxacin 400mg daily

• Prednisone 20 mg daily

REFERRALS

• Infectious Disease

• Otolaryngology

• Ophthalmology

FURTHER DIAGNOSTIC TESTS

• G6PD

• CBC

• LFT’s

• Eosinophilia

• Hep B Surg AB

• Strongylidiasis AB

• Stools O & P

• Crypto/Giardia

• PPD

• CXR

• Cat Scan/Thorax

• Toxocara Canis AB

Foot drop & ulnar damage

IMPORTANT LESSON TO

REMEMBER

• Leprosy can be cured

• Leprosy is a slow disease

• Leprosy takes a long time to come and

a long time to go away

• Medication can cure leprosy patches,

but not deformity

SUGGESTED READING

CHINESE PROVERB

• “What we hear, we forget,

• What we see, we remember,

• What we do, we know.”